Pitch shackle



Nov. 12, 1929. i2. H. ANDERSON PITCH SHACKLE Filed Sept. 7, 1927 15 novel means for tightly holding the bolts the blocks 11 tightly against the bolts 7, thus .6

.35 The drawing above briefly described, ilprising a longitudinal recess in said shackle,

PatentedNov. 12, 1929 7 it r in r UNITED STATE P TE T OHE iz ROY H. ANDERSON, or LONG IliEAQH, oALIronNIA i PITCH sHaoKLn" p Application filed September 7,1922. Serial I To 217,96 G

The invention relates to improvements in m'embersll preferably in the formof metal shackles, commonly termed pitch shackles, blocks as shown, the. outer ends ofv those used for connecting steam shovel buckets blocks being adapted to abut the'bolts' 7 *to with the carrying legs thereof. The shackle hold the latter tightlyin the openings6.

5 commonly used is formed with bolt receiv- The inner ends of these blocks are in contact 55 ing openings at its ends, and bolts pass with opposite edges of a wedge 12 which;

7 through these openings and through aperpasses slidably through a transverse opentured lugs on the leg and bucket, but in short ing 1313 in the shackle 5. The small end time, the openings become so enlarged in the of this wedge is provided with-a threaded link that a great deal of lost play is perstud 14 upon which a nut 15 and washer'16 mitted, accompanied by noise which it is deare disposed, said nut and washer engaging sirable to prevent. the exterior of the shackle. Thus, ;upon' It is the object of my invention to provide tightening of V the nut 15, thewedge 12 is a new and improved shackle provided with drawn inwardly, thereby causing it to force against lateral play in the bolt receiving efiectively holdlng the latter against lateral openings at the ends of said shackle, the play. I p construction being such that all wear may As above stated, excellent results are obbe effectively taken up. 3 tainable from the details disclosed and they 20 l/Vith the foregoing in view, the invention are therefore preferably followed. Howresides in the novel subject matter hereinever, the present disclosure is to be conafter described and claimed, the description sidered as illustrative rather than limiting. being supplemented by the accompanying I claim: drawing. I I 1. An improvement in a steam shovel of 2 Fig. 1 is aside elevation showing the applithe type having a leg, a bucket connected at 7 cation of the shackle. 1 V its lower rear portion with the front end of Fig. 2 is a central vertical longitudinal sec- Said leg, a rearwardly projecting bifurcated, tional view through the shackle, parts being lug on the upper end of the bucket, an upin elevation. wardly projecting bifurcated lug on the front 30 Fig. 3 is a horizontal sectional view on the end of said leg spaced behind the first named line 3-3 of Fig. 2. r lug, a pitch shackle whose ends are received FigAisaperspective view of the bolt holdbetween the furcations of ,said lugs, and ing plungers and the operating wedge theretransverse pins passing through said lugs for. and shackle ends; said improvement comlustrates the preferred form of construction blocks slidable in the ends of said'recess and and while this construction will be herein abutting said pins to tightly bind them in specifically explained, it is to 'be understood the pin-receiving openings of the shackle, that within the scope of the invention as and means for positively forcing said blocksi 1 40 claimed,variations may be made. outwardly. V .90 The numeral 5 in the drawing denotes the 2. An improvement in a steam shovel of improved shackle, said shackle being of the the type having a leg, a bucket connected at usual elongation and being longitudinally its lower-rear portion with the front end i hollow. Atits ends, this shackle is formed of said leg, a rearwardly projecting bifure with spaced, longitudinally extending paralcated lug on the upper end of the bucket, lel lugs in which are formed transverse opens an upwardly projecting bifurcated lug on ings 6 to receive the usual pins or bolts 7 for the front end of said leg spaced behind'the connecting the shackle with the lugs 8 on the first named lug, a pitch shackle whose ends" bucket 9 and the leg 10. Slidably mounted are received between the furcations of said within the shackle 5, are two bolt holding lugs, and transverse pins passing through 2 u.

said lugs and shackle ends; said improve-. 'ment comprising a longitudinal recess in said shackle, a transverserecess in the shackle in-, tersecting said longitudinal recess, blocks i slidable in the ends of said longitudinal recess and abutting said pins to tightly bind them in the pin receiving openings of the. shackle, a wedge in said transverse recess abutting the inner ends of said blocks, and

threaded tightening means for said wedge.

. 3. A pitch shackle comprising a hollow body having on each of its ends a pair o f laterally' spaced, longitudinally extending parallel lugs in which. are formed alined transverse bolt-receiving openings, the (zen tral portion of said.body;being formedv with atapered, transverse wedgefreceiving open-- ing, two solid fiat-sided bolt-engagingblooks slidably mounted in the body of the shackle between the bolt-receiving and wedge-receivingopenings, a wedge insaid wedge-receiw, ing openingcontacting with said blocks to force them against the bolts in said bolt-receiving openings, therebytightly holding the bolts in said bolt-receiving openings, and

means for tightening said wedge.

. n testimony whereof I have hereunto afiixed my signature. .7

ROY H.- ANDERSON; 

